121021220100210 has 128 divisors (see below), whose sum is σ = 306897225891840. Its totient is φ = 30481244699136.

The previous prime is 121021220100199. The next prime is 121021220100217. The reversal of 121021220100210 is 12001022120121.

It is a super-4 number, since 4×121021220100210⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121021220100210.

It is not an unprimeable number, because it can be changed into a prime (121021220100217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44301447 + ... + 46953813.

It is an arithmetic number, because the mean of its divisors is an integer number (2397634577280).

Almost surely, 2^{121021220100210} is an apocalyptic number.

121021220100210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121021220100210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153448612945920).

121021220100210 is an abundant number, since it is smaller than the sum of its proper divisors (185876005791630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121021220100210 is a wasteful number, since it uses less digits than its factorization.

121021220100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653232.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121021220100210 its reverse (12001022120121), we get a palindrome (133022242220331).

The spelling of 121021220100210 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twenty million, one hundred thousand, two hundred ten".